Epidemics of soybean rust (Phakopsora pachyrhizi) in Brazil and Paraguay from 2001 to 2003

J. T. Yorinori, W. M. Paiva, R. D. Frederick, L. M. Costamilan, P. F. Bertagnolli, G. E. Hartman, C. V. Godoy, J. Nunes

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Abstract

In 5 March 2001, a severe rust outbreak was recorded at Pitapó, Paraguay, and the causal organism was determined to be Phakopsom pachyrhizi using polymerase chain reaction (PCR) and DNA sequence analysis. In May, rust surveys showed spread throughout most of Paraguay and into western and northern Parana, Brazil. In the 2001-02 season, rust was widespread in Paraguay, but losses were reduced due to severe drought; however, in Brazil it spread to more than 60% of the soybean acreage, causing field losses estimated at 0.1 million metric tons (MMT). In 2003, the disease was observed in more than 90% of the fields in Brazil, and the projected losses in Mato Grosso and Bahia alone are 2.2 MMT (US$487.3 million). Approximately 80% of the soybean acreage in Brazil was sprayed twice with fungicides at the cost of US$544 million. Differences in efficacy have been observed among the commercial strobilurin and triazol fungicides.

Original languageEnglish (US)
Pages (from-to)675-677
Number of pages3
JournalPlant disease
Volume89
Issue number6
DOIs
StatePublished - Jun 1 2005

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science

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    Yorinori, J. T., Paiva, W. M., Frederick, R. D., Costamilan, L. M., Bertagnolli, P. F., Hartman, G. E., Godoy, C. V., & Nunes, J. (2005). Epidemics of soybean rust (Phakopsora pachyrhizi) in Brazil and Paraguay from 2001 to 2003. Plant disease, 89(6), 675-677. https://doi.org/10.1094/PD-89-0675